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Test Your Skills: BITSAT Physics Thermal Properties Of Matter
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BITSAT Physics Thermal Properties Of Matter Objective Questions
Question: A steel wire of length ‘L’ at 40°C is suspended from the ceiling and then a mass ‘m’ is hung from its free end. The wire is cooled down from 40°C to 30°C to regain its original length ‘L’. The coefficient of linear thermal expansion of the steel is 10–5 /° C, Young’s modulus of steel is 1011 N/ m2 and radius of the wire is 1 mm. Assume that L >>diameter of the wire. Then the value of ‘m’ in kg is nearly
- a) 1
- b) 2
- c) 3
- d) 5
Answer: 3
Question: During vapourisation
- a) Change of state from liquid to vapour state occurs.
- b) Temperature remains constant.
- c) Both liquid and vapour states coexist in equilibrium.
- d) All of the above
Answer: All of the above
Question: Two spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the larger sphere is 25 minute and for smaller one is 16 minute, the ratio of thermal conductivities of the materials of larger spheres to that of smaller sphere is
- a) 4 : 5
- b) 5 : 4
- c) 25 : 8
- d) 8 : 25
Answer: 8 : 25
Question: The wavelength of radiation emitted by a body depends upon
- a) The nature of its surface
- b) The area of its surface
- c) The temperature of its surface
- d) All of the above
Answer: All of the above
Question: Figure shows a copper rod joined to a steel rod. The rods have equal length and equal crosssectional area. The free end of the copper rod is kept at 0ºC and that of steel rod is kept at 100ºC. Find the temperature of the junction of the rod. Conductivity of copper = 390 W/mºC. Conductivity of steel = 46 W/m ºC
- a) 18.01ºC
- b) 26ºC
- c) 10.6ºC
- d) 20ºC
Answer: 10.6ºC
Question: If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q ?
- a) Q/4πR2 σ
- b) (Q/4πR2σ)–1/2
- c) (4πR2Q/σ)1/4
- d) (Q/4πR2σ)1/4
Answer: (Q/4πR2σ)1/4
Question: A solid body of constant heat capacity 1 J/°C is being heated by keeping it in contact with reservoirs in two ways : (i) Sequentially keeping in contact with 2 reservoirs such that each reservoir supplies same amount of heat. (ii) Sequentially keeping in contact with 8 reservoirs such that each reservoir supplies same amount of heat. In both the cases body is brought from initial temperature 100°C to final temperature 200°C. Entropy change of the body in the two cases respectively is :
- a) ln2, 2ln2
- b) 2ln2, 8ln2
- c) ln2, 4ln2
- d) ln2, ln2
Answer: ln2, ln2
Question: The radiation emitted by a perfectly black body is proportional to
- a) Temperature on ideal gas scale
- b) Fourth root of temperature on ideal gas scale
- c) Fourth power of temperature on ideal gas scale
- d) Square of temperature on ideal gas scale
Answer: Fourth power of temperature on ideal gas scale
Question: A copper sphere cools from 62°C to 50°C in 10 minutes and to 42°C in the next 10 minutes. Calculate the temperature of the surroundings.
- a) 18.01ºC
- b) 26ºC
- c) 10.6ºC
- d) 20ºC
Answer: 20ºC
Question: One kilogram of ice at 0°C is mixed with one kilogram of water at 80°C. The final temperature of the mixture is (Take specific heat of water = 4200 kJ/kg-°C, Latent heat of ice = 336 kJ/kg)
- a) 0°C
- b) 40°C
- c) 50°C
- d) 60°C
Answer: 0°C
Question: A body of length 1m having cross-sectional area 0.75m2 has heat flow through it at the rate of 6000 Joule/sec. Then find the temperature difference if K = 200 Jm–1K–1
- a) 20°C
- b) 40°C
- c) 80°C
- d) 100°C
Answer: 40°C
Question: Which of the following combinations of properties would be most desirable for a cooking pot?
- a) High specific heat and low conductivity
- b) Low specific heat and high conductivity
- c) High specific heat and high conductivity
- d) Low specific heat and low conductivity
Answer: Low specific heat and high conductivity
Question: Two bodies A and B are placed in an evacuated vessel maintained at a temperature of 27ºC. The temperature of A is 327ºC and that of B is 227ºC. The ratio of heat loss from A and B is about
- a) 2 : 1
- b) 1 : 2
- c) 4 : 1
- d) 1 : 4
Answer: 2 : 1
Question: 250 gm of water and an equal volume of alcohol of mass 200 gm are placed successively in the same calorimeter and cools from 60ºC to 55ºC in 130 sec and 67 sec respectively. If the water equivalent of the calorimeter is 10 gm., then the specific heat of alcohol in cal/gm ºC is :
- a) 1.30
- b) 0.67
- c) 0.62
- d) 0.985
Answer: 0.62
Question: A heat flux of 4000 J/s is to be passed through a copper rod of length 10 cm and area of crosssection 100 sq. cm. The thermal conductivity of copper is 400 W/mC. The two ends of this rod must be kept at a temperature difference of –
- a) 1ºC
- b) 10ºC
- c) 100ºC
- d) 1000ºC
Answer: 100ºC
Question: Two straight metallic strips each of thickness t and length l are rivetted together. Their coefficients of linear expansions are α1 and α2 . If they are heated through temperature ΔT, the bimetallic strip will bend to form an arc of radius
- a) t/{α1 + α2)ΔT}
- b) t/{(α2 – α1)ΔT}
- c) t(α1 – α2)ΔT
- d) t(α2 – α1)ΔT
Answer: t/{(α2 – α1)ΔT}
Question: A steel rod of length 50 cm has a cross-sectional area of 0.4 cm2. What force would be required to stretch this rod by the same amount as the expansion produced by heating it through 10ºC. (α = 10–5 K–1 and Y = 2 × 1011 N/m2
- a) 600 N
- b) 800 N
- c) 500 N
- d) 400 N
Answer: 800 N
Question: Which of the following circular rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
- a) r = 2r0; l = 2l0
- b) r = 2r0; l = l0
- c) r = r0; l = 2l0
- d) r = r0; l = l0
Answer: r = 2r0; l = l0
Question: Find the quantity of heat required to convert 40 gm of ice at –20°C into water at 20°C.Given Lice = 0.336 × 106 J/kg. Sp heat of ice = 2100 J/kg-K sp heat of water= 4200 J/kg-K
- a) 12480 J
- b) 10420 J
- c) 16450 J
- d) 18480 J
Answer: 18480 J
Question: Which of the following combinations of properties would be most desirable for a cooking pot?
- a) High specific heat and low conductivity
- b) Low specific heat and high conductivity
- c) High specific heat and high conductivity
- d) Low specific heat and low conductivity
Answer: Low specific heat and high conductivity
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BITSAT Physics Thermal Properties Of Matter Objective Test Questions
Students can use these MCQs for Thermal Properties Of Matter to quickly test their knowledge of the chapter. These multiple-choice questions have been designed as per the latest syllabus for BITSAT Physics released by BITSAT. Our expert teachers suggest that you should practice daily and solve these objective questions of Thermal Properties Of Matter to understand the important concepts and get better marks in your school tests.
Core Objective Practice Sets for Thermal Properties Of Matter
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